Bug 91955

Created attachment 118177 [details]
error logs & pertinent system info

Well described on http://forums.linuxmint.com/viewtopic.php?f=208&t=178600&p=1064217#p1064217

"...  Cinnamon will freeze everything up for about 10 to 30 seconds. Sometimes it also takes over two minutes and I decide to kill it from Ctrl+Alt+F1. Sometimes it unlocks from that terminal (with the help of DISPLAY=:0 cinnamon --replace), sometimes I have to restart the session and loose any unsaved work. While frozen, the clock does not update, I cannot use alt+tab, I cannot open the start menu, I cannot click anything, I basically can't do anything besides moving my cursor around. The windows will also not update: if someone says something in a chat, I won't see it until it unfreezes. However music keeps playing, networking is uninterrupted and everything in ctrl+alt+f1 works fine.

While frozen, if I run top/htop/iotop in the ctrl+alt+f1 terminal, there is nothing unusual to see. Little cpu load, ssd is mostly idle, RAM is far from full, and I don't use swap. There doesn't seem to be anything odd in dmesg.

I haven't been able to find steps to reproduce the issue. The frequency seems to increase when I do a lot of alttabbing or when Libreoffice is open, but I really can't say that with any certainty."

Copy of sys error log and DRM error log attached.